1. Section of Pediatric Neurosurgery, Children's Hospital, Birmingham;
2. Clarian Neuroscience, Goodman Campbell Brain and Spine, Department of Neurological Surgery, Indiana University, Indianapolis, Indiana;
3. Department of Anatomical Sciences, St. George's University, Grenada; and
4. Department of Diagnostic Radiology, Division of Neuroradiology, University of Alabama at Birmingham, Alabama;
5. Department of Anatomy, University of Varmia and Masuria, Olsztyn, Poland